This study will only include infants born to mothers who are tested as seronegative for human immunodeficiency virus (HIV) & hepatitis B surface antigen (HBsAg). The purpose of this study is to demonstrate in infants who received a birth dose of hepatitis B vaccine that Tritanrix™-HepB/Hib-MenAC vaccine is at least as good as Tritanrix™-HepB/Hiberix™ with respect to immunogenicity of the hepatitis B antigen.